Hello bevito!If you use Onlyoffice Enterprise Edition for Docker and installed it with installation script then folders are mapped into app/onlyoffice. And the license.lic file is on the path /app/onlyoffice/DocumentServer/data. Udpating process is the same like you would do it mannually: stop containers, delete containers, download new containers and run new containers.

OnlyOffice is working, but the licence is gone.

That is very strange that the licence is gone! I cannot say why it happend.